What is it that you want to do? If you plan on adding a supercharger then the compression bump from the PI's isn't so great for that. I have seen ported NPI's from Renegade Racing that flow as well as St2 ported PI's but it is expensive...thats why i jumped on a deal for some used VTst2 heads instead of sending my NPI's out.
There is power to be had from both heads but a cheap set of stock PI's with the PI cams/intake will make a nice difference compared to the stock NPI setup.
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